Help for removing password for CASwell COB-H500

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  • daniel_sa
    New Member
    • Feb 2023
    • 2
    • US
    #1

    Help for removing password for CASwell COB-H500

    Hi, I'm pulling my hair out with this x86 network device.

    bios info: AMI aptio V
    Hardware: CASwell COB-H500
    its OEM product, no support is available.
    Device has no monitor output, Screen is redirected to serial port(VT100).

    I have already tried the list below.

    - cmospwd *-> no luck

    - I read the BIOS using ch341, and checked with UEFITool, I thought I could find something useful. All I could find was the invalid part, which was "161406223039397D161A17781D6065657C19"
    I used this https://www.dcode.fr/xor-cipher tool to decode it; it was "CASwell(COB-H500)L"
    I tried different combinations to enter the password with this text. None of them were successful.

    - AMITSESetup region check -> all values were zero.* so I couldn't retrieve any hash.

    - There was another SPI EEPROM under the CPU (no, it wasn't I2C); I removed it; the computer boots but still requests a password. I checked the eeprom file, and it looks like some executable is lying there because I found FINI text inside. The chip is ST M95128.

    - It is not giving any code after unsuccessful password attempts. So no luck with that.

    - sure cmos reset not works since password is hard-coded.

    I attached the bios and EEPROM files. Could you please give me some hints?
    Thank you.
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